Loans & EMI7 min readPublished 24 Sept 2026
How to Calculate Loan EMI: Formula, Manual Calculation Steps & Prepayment Savings
Learn how banks calculate loan EMI using the reducing balance formula. Discover step-by-step mathematical examples, how interest is front-loaded, and how to save lakhs.
Precious Thakur & Banking Research DeskSenior Financial Infrastructure Analyst
Fact-Checked & RBI Compliant
Key Takeaways & Summary
- Standard EMI formula: E = P * r * (1 + r)^n / ((1 + r)^n - 1).
- Interest is heavily front-loaded in the first 5 years of long-term loans.
- Prepaying even 1 extra EMI per year can shorten a 20-year home loan by 3 to 4 years.
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Understanding how your monthly loan EMI is calculated gives you tremendous financial leverage over banks. You will know exactly how much interest you owe, how rate hikes alter your tenure, and how strategic prepayments can shave years off your debt.
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Frequently Asked Questions
What is the exact mathematical formula for loan EMI?
The formula is: EMI = [P x r x (1 + r)^n] / [(1 + r)^n - 1], where P is Principal, r is periodic monthly interest rate (Annual Rate / 12 / 100), and n is total months.